package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    public static final String VX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";
    public static final String Grant_Type = "authorization_code";

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatProperties weChatProperties;

    /**
     * 微信登录
     */
    @Override
    public User vxLogin(UserLoginDTO userLoginDTO) {

        //1.调用微信接口，获取Openid
        String openid = getOpenid(userLoginDTO);

        //2.判断openid是否为空，如果为空，则说明登录失败，抛出业务异常
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //3.如果openid不为空，判断当前微信用户的openid是否在数据库中(即判断用户是否为新用户)，如果不存在，则自动注册
        User user = userMapper.getByOpenid(openid);
        if(user == null){
           user =  User.builder()
                .openid(openid)
                .createTime(LocalDateTime.now())
                .build();
           userMapper.insert(user);
        }

        //4.如果存在，则登录成功，直接返回user
        return user;
    }

    //获取openid
    private String getOpenid(UserLoginDTO userLoginDTO) {
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type", Grant_Type);
        String json = HttpClientUtil.doGet(VX_LOGIN_URL, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
